Photocatalytic CdSe QDs-decorated ZnO nanotubes: an effective photoelectrode for splitting water

Chouhan, Neelu; Yeh, Chai; Hu, Shu Fen; Liu, Ru‐Shi; Chang, Wen Sheng; Chen, Kuei‐Hsien

doi:10.1039/c0cc05548d

Cited by 89 publications

(44 citation statements)

References 24 publications

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“…Whereas, the wide band gap (3.2 eV) of TiO 2 material limits its practical application because it only can be excited with light of wavelength near or shorter than 385 nm. Other metal oxide semiconductors such as WO 3 , ZnO, BiVO 4 and so have been extensively studied for photo-electrochemical water splitting [2][3][4][5][6][7][8]. However, because of the difficulty in discovering a single semiconductor that is capable of splitting water into hydrogen and oxygen, efforts to develop and optimize semiconductors for independent water oxidation and reduction are more realistic [9].…”

Section: Introductionmentioning

confidence: 99%

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Momeni

Ghayeb

Mohammadi

2014

J Mater Sci: Mater Electron

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Self-organized iron oxide nanotubes were successfully prepared on the iron foils by a simple electrochemical anodization method in NH 4 F organic electrolyte. The Fe 2 O 3 nanotubes were characterized by field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, UV-vis absorbance spectra, and X-ray diffraction spectroscopy. Scanning electron microscopy images show that dependent upon the anodizing time, the pore diameters range from 30 to 45 nm. Crystallization and structural retention of the synthesized structure are achieved upon annealing the initial amorphous sample in oxygen atmosphere at 450°C for 1 h. The crystallized nanoporous film, having a 2.04 eV bandgap, exhibited a maximum photocurrent density of 0.68 mA cm -2 in 1 M NaOH at 0.5 V versus Ag/AgCl. The current potential characteristics showed that the water-splitting photocurrent strongly depends on the anodizing time and its increases with anodization time.

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Section: Introductionmentioning

confidence: 99%

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Momeni

Ghayeb

Mohammadi

2014

J Mater Sci: Mater Electron

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“…However, the intrinsic band gap of TiO 2 (3.2 eV) and high recombination rate of photogenerated electron-hole pairs are the main drawbacks limiting the future improvement of photochemical activity. Various attempts such as substitutional element doping [10][11][12] and surface modification with noble metal and semiconductor [13][14][15] have been successfully tried to overcome the two obstacles. Coupling a second narrow band-gap semiconductors with a more negative conduction band level can result in the vectorial transfer of conduction band electrons and valence band holes from one semiconductor to another.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CdTe/TiO2 nanoparticles and their photocatalytic activity

Wang

et al. 2013

Materials Research Bulletin

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“…CdS sensitized ZnO nanorod array shows a photocurrent densities of 23.7 and 15.8 mA cm À2 at a 0 V bias under the illumination of simulated sunlight and visible light, respectively [77]. CdSe sensitized ZnO nanotube shows~5 mA cm À2 at 0.35 V vs SCE [78]. Wang et al [79] reported double-sided CdS and CdSe quantum dot co-sensitized ZnO nanowire arrays yielding a photocurrent of~12 mA cm À2 at 0.4 V vs Ag/AgCl.…”

Section: Quantum Dot (Qd) Sensitizationmentioning

confidence: 99%

Recent progress in enhancing solar-to-hydrogen efficiency

Chen

Yang

Song

et al. 2015

Journal of Power Sources

119

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h i g h l i g h t sRecent progress in enhancing solar-to-hydrogen (STH) efficiency is reviewed. Light absorption, charge separation-migration and surface reaction are evaluated. Doping, quantum dot, and plasmon enhancement are the keys to high STH efficiency. Co-catalysts and nanostructured surfaces improve surface reactions effectively. Multiple excitons, upconversion, and synergic strategies are promising areas. a b s t r a c tSolar water splitting is a promising and ideal route for renewable production of hydrogen by using the most abundant resources of solar light and water. Focusing on the working principal of solar water splitting, including photon absorption and exciton generation in semiconductor, exciton separation and transfer to the surface of semiconductor, and respective electron and hole reactions with absorbed surface species to generate hydrogen and oxygen, this review covers the comprehensive efforts and findings made in recent years on the improvement for the solar-to-hydrogen efficiency (STH) determined by a combination of light absorption process, charge separation and migration, and catalytic reduction and oxidation reactions. Critical evaluation is attempted on the strategies for improving solar light harvesting efficiency, enhancing charge separation and migration, and improving surface reactions. Towards the end, new and emerging technologies for boosting the STH efficiency are discussed on multiple exciton generation, up-conversion, multi-strategy modifications and the potentials of organometal hybrid perovskite materials.

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Photocatalytic CdSe QDs-decorated ZnO nanotubes: an effective photoelectrode for splitting water

Cited by 89 publications

References 24 publications

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Solar water splitting for hydrogen production with Fe2O3 nanotubes prepared by anodizing method: effect of anodizing time on performance of Fe2O3 nanotube arrays

Synthesis of CdTe/TiO2 nanoparticles and their photocatalytic activity

Recent progress in enhancing solar-to-hydrogen efficiency

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